"Iä" is a word used to address eldritch Lovecraftian gods of supreme cosmic evil. Probably the (currently) most common use of this greeting is "Iä! Iä! Cthulhu fhtagn!" Which basically translates to "Hail! Hail! Cthulhu sleeps!" "Iä!" is pronounced thusly: ee-AY! (same phoenetic vowel combination as "eat cake.") This word can also be used to describe something suitably badass, or perhaps evil in a hokey sort of way. It's quite versatile.

Have you seen that new Pope? When I see him, I don't know whether to cross myself or to cry out Iä!

insha'Allah, the Arabic language expression meaning "God willing," is used as a qualifier for all planned future actions to remind the speaker and listener that nobody can positively know what the future will bring, but rather, all depends on the will of God.

See you tomorrow, i'A!
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A: "Are you coming tonight?"
B: "i'A."
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i'A the next project will be easier.